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基金项目:国家自然科学基金资助项目(45""#$"6);中国科学院重点基金资助项目(7859!:;#:!$6)
收稿日期:!$$<:##:$6;修订日期:!$$":$=:#6
作者简介:邵景安(#5"< >),男,安徽亳州人,博士,主要研究领域土地利用与生态过程2 (:?@A1:BC@0D@E 1FGAB2 @H2 HI
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致谢:QG O0M1K 1ARG N0 NC@IR AIKA3AKM@1B OC0 @BBABNGK AI KGBALIAIL @IK B@?J1AIL 0P NCAB GSJGFA?GIN2
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保护性耕作对稻田土壤有机质的影响
邵景安#,!,唐晓红#,魏朝富#,",谢德体#
(#2 西南大学 资源环境学院,重庆Y 4$$"#<;!2 中国科学院地理科学与资源研究所,北京Y #$$#$#)
摘要:研究使用常规犁耕:休闲(Z’V),常规犁耕:小麦(Z’Q),保护耕作:休闲(&’V),保护耕作:小麦(&’Q)4 个处理,评价连续
实验 #$@后保护性耕作对稻作区 -)[的影响。结果表明:垄作、免耕和小麦种植的结合是稻作区一种较好的保护性耕作实践。
它不仅显著增加 -)[在土壤表层的聚集,而且它也通过改变 -)[的组成和结构显著影响土壤胡敏酸的光谱和热解特性。相
比其他处理,垄作免耕(稻麦)在 $ > #$ H?土层拥有最多的 -)[ 含量,但随着土层厚度的增加,这一含量下降的也较为迅速。
垄作免耕(稻麦)土壤胡敏酸在波长 <<9 I?处的光密度为 $2 #!!,4<9 I?处为 $2 "$9,而常规平作(中稻)在这两个波长处却分
别为 $2 $ 6<9 \处放热峰的焓变值比常规平作低,#$$$ > #$9$ H? ]#吸收峰
常规平作也比垄作免耕强。垄作免耕土壤腐殖质的氧化稳定系数增高,表明长期垄作免耕土壤腐殖酸的缩合度增高,芳构化程
度增强。通过保护性耕作和作物实践可以管理稻田土壤,维持充分的 -)[积累,缓解土壤有机碳的丢失。
关键词:保护性耕作;小麦耕作;土壤有机质;稻作区
文章编号:#$$$:$566(!$$")##:4464:$5Y 中图分类号:^#4!,^54=Y 文献标识码:%
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参考文献:
[2M]: 魏朝富,车福才,高明,等& 垄作免耕下稻田土壤团聚体和水热状况变化的研究& 土壤学报,*334,56(5):265 ^ 268&
[54]: 窦森,陈恩凤,须湘成,等& 施用有机物料对土壤胡敏酸结构特征的影响<胡敏酸的光学性质& 土壤学报,233M,75(2):N2 ^ N3&
5NNN : 生: 态: 学: 报: : : 56 卷: